Source：Shengda Yu Published：2020-07-28 Clicks：7065
Law 1, look at the appearance, the surface of the repaired motor should be clean and clean, although the motor is not high-tech electrical appliances, but if the outside is full of oil, it is difficult to ensure that the interior can be cleaned well, if the internal putty is not cleaned, it is bound to affect future use.
Method 2, manual trial rotation, in the case of no electricity, the rotation of the motor should be smooth, without any sense of obstruction.
Method 3. Judge the maintenance quality of the motor after maintenance by ammeter:
After maintenance, the motor will be connected and turned on in no-load time and space before the equipment is installed. The purpose of doing this is to check whether the repaired motor has the situation of leakage protector jumping after electrification. If the leakage and power jump occurs, the motor does not need to be removed and sent back for repair if the equipment has not been installed, which will not increase the amount of labor. If there is no abnormality after electrification, the no-load current can be measured by the ammeter, and then according to the magnitude of the no-load current, it is necessary to feedback with the maintenance personnel. The basis for judging the maintenance quality according to the no-load current: if the size of the air gap between the rotor and the stator, the friction force and the non-standard assembly after maintenance will have an impact on the no-load current. When the no-load current increases, the corresponding power factor will decrease. When the motor keeps the rated current and rated voltage constant, the output power of the motor will decrease due to the decrease of the power factor. If such a motor is used under rated load, the motor is easy to generate.
Hot, easy to burn after a long time, affecting the service life.